const char *name="rvs";
const char *ver="0.8c";
/* Copyright (C) 2009 Luke Shumaker
   
   This file is part of rvs.
   
   rvs is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your
   option) any later version.
   
   rvs is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with rvs; see the file COPYING.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <error.h>

const char *libexecdir="./plugins";
const char *plugin_conf="plugin.conf";

const size_t strgran=10;

void *xmalloc (size_t size)
{
	register void *value = malloc (size);
	if (value == 0)
		error(EXIT_FAILURE,0,"virtual memory exhausted");
	return value;
}

void *xrealloc (void *ptr, size_t size)
{
	register void *value = realloc (ptr, size);
	if (value == 0)
		error(EXIT_FAILURE,0,"virtual memory exhausted");
	return value;
}

void stradds(size_t *size, char **dest, char *str)
{
	if (*size > ( strlen(*dest) + strlen(str) )) {
		strcat(*dest, str);
	} else {
		*size = strlen(*dest) + strlen(str) + 1;
		
		char *string;
		string = (char *) xrealloc (*dest, *size);
		strcat(string, str);
	}
}

void load_plugin_comment (FILE *file)
{
	char c;
	while ( (c=getc(file)) != EOF ) {
		if ( c == '\n' ) {
			ungetc (c, file);
			break;
		}
	}
}

int load_plugin_command (FILE *file);

int load_plugin_depend (FILE *file)
{
	int nbytes = 10;
	char *string = (char *) malloc(nbytes);
	
	char c[2] = " \0";
	char *cs = &c;
	while ( (c[0]=getc(file)) != EOF ) {
		if (c[0] == '\n') {
			printf("%s | ",string);
			ungetc (c[0], file);
			break;
		} else {
			switch (c[0]) {
				case '\\':
					c[0]=getc(file);
					switch (c[0]) {
						case 'n':
							c[0] = '\n';
						case '\\':
						case '#':
							stradds(&nbytes,&string,cs);
							break;
						default:
							error(EXIT_FAILURE,0,"syntax error");
							break;
					}
					break;
				case '#':
					load_plugin_comment(file);
					break;
				default:
					stradds(&nbytes,&string,cs);
					break;
			}
		}
	}
	return 0;
}

int load_plugin_command (FILE *file)
{
	int nbytes = 10;
	char *string = (char *) malloc(nbytes);
	
	char c[2] = " \0";
	char *cs = &c;
	while ( (c[0]=getc(file)) != EOF ) {
		if (c[0] == '\n') {
			printf("%s\n",string);
			load_plugin_command(file);
			break;
		} else {
			switch (c[0]) {
				case '\\':
					c[0]=getc(file);
					switch (c[0]) {
						case 'n':
							c[0] = '\n';
						case '\\':
						case '#':
						case ':':
							stradds(&nbytes,&string,cs);
							break;
						default:
							error(EXIT_FAILURE,0,"syntax error");
							break;
					}
					break;
				case '#':
					load_plugin_comment(file);
					break;
				case ':':
					load_plugin_depend(file);
					break;
				default:
					stradds(&nbytes,&string,cs);
					break;
			}
		}
	}
	return 0;
}

int load_plugin (char *plug_name)
{
	printf("loading plugin `%s'\n",plug_name);
	
	chdir(plug_name);
	FILE *file = fopen(plugin_conf,"r");
	
	/* fopen gives NULL on failure */
	if ( file == NULL ) {
		error(EXIT_FAILURE,errno,
			"%s/%s/%s",libexecdir,plug_name,plugin_conf);
	} else {
		load_plugin_command(file);
	}
	fclose( file );
	chdir("..");
	return 0;
}

int load_plugins ()
{
	chdir(libexecdir);
	
	DIR *dp;
	struct dirent *ep;
	int serr;
	struct stat sbuf;
	dp = opendir ("./");
	if (dp != NULL) {
		while (ep = readdir (dp)) {
			if ((strcmp(ep->d_name,"." )!=0)&&
			    (strcmp(ep->d_name,"..")!=0)) {
				serr = stat(ep->d_name, &sbuf);
				if (!serr && S_ISDIR(sbuf.st_mode)) {
					load_plugin(ep->d_name);
				}
			}
		}
		(void) closedir (dp);
	}
	else
		error(EXIT_FAILURE,errno,"%s/",libexecdir);
	return 0;
}

int main (void)
{
	load_plugins();
	return 0;
}